package com.itheima;

import java.util.Comparator;
import java.util.TreeSet;

public class TreeSetDemo {
    public static void main(String[] args) {

        int a[]={1,2,3,4};
        //集合
        TreeSet<Integer> set1=new TreeSet<>();
        set1.add(1);
        set1.add(2);
        set1.add(3);
        set1.add(4);
        for (Integer integer :set1) {
            System.out.println(integer);
        }

    }
    public static void test1(){
        TreeSet<Student> set=new TreeSet<Student>();

        set.add(new Student("郑巧",20));
        set.add(new Student("罗燕",18));
        set.add(new Student("罗欢",19));
        set.add(new Student("罗杨",21));

        for (Student student:set){
            System.out.println(student.getName()+"---"+student.getAge());
        }

    }
    public static void test2(){

        Comparator<Student>comparator=(o1,o2)->o1.getAge()-o2.getAge();

        TreeSet<Student> set=new TreeSet<>(comparator);
        set.add(new Student("郑巧",20));
        set.add(new Student("罗燕",18));
        set.add(new Student("罗欢",19));
        set.add(new Student("罗杨",21));

        for (Student student:set){
            System.out.println(student.getName()+"---"+student.getAge());
        }
    }
    public static int sun(int...a){
        int total=0;
        for(int i=0;i<a.length;i++){
            total+=a[i];
        }
        return total;
    }
}

